diff --git a/.env b/.env
new file mode 100644
index 0000000..1941a2f
--- /dev/null
+++ b/.env
@@ -0,0 +1,4 @@
+CRYPKIT_POSTGRES_HOST=localhost
+CRYPKIT_POSTGRES_USERNAME=test
+CRYPKIT_POSTGRES_PASSWORD=test
+CRYPKIT_POSTGRES_DATABASE_NAME=test
diff --git a/.github/workflows/python-app.yaml b/.github/workflows/python-app.yaml
index 71df822..41057fb 100644
--- a/.github/workflows/python-app.yaml
+++ b/.github/workflows/python-app.yaml
@@ -12,7 +12,7 @@ permissions:
   contents: read
 
 jobs:
-  test:
+  unit-test:
 
     runs-on: ubuntu-latest
 
@@ -32,5 +32,5 @@ jobs:
       - name: Run linting
         run: make lint
 
-      - name: Run tests
-        run: poetry run pytest
\ No newline at end of file
+      - name: Run unit tests
+        run: poetry run pytest tests/unit
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 0a19790..0e56abb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -128,7 +128,7 @@ celerybeat.pid
 *.sage.py
 
 # Environments
-.env
+#.env
 .venv
 env/
 venv/
diff --git a/README.md b/README.md
index 30ea192..ba8f044 100644
--- a/README.md
+++ b/README.md
@@ -26,11 +26,28 @@ I analysed the assignment and decided to do the following things:
 - Generate openapi documentation using FastAPI
 - Think about further improvements
 
+## Local setup
 
-## Further improvements 
+You need to install poetry and dependencies with it:
+
+```shell
+pip install poetry
+poetry install
+```
+
+## How to run tests
+
+There are multiple test levels.
+
+For unit tests you don't anything special. Just run them in you IDE.
+
+For integration tests you need running compose, so run `docker compose up --build -d` before running them.
+
+## Further improvements
 
 We can do:
 
+- run integration tests in github CI/CD using services
 - Load testing with Locust
 - Add authentication and authorization (for example with keycloack and JWT tokens)
 - Add ratelimiting
diff --git a/alembic.ini b/alembic.ini
new file mode 100644
index 0000000..9c0eb8e
--- /dev/null
+++ b/alembic.ini
@@ -0,0 +1,105 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to alembic/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:alembic/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+;sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/alembic/README b/alembic/README
new file mode 100644
index 0000000..98e4f9c
--- /dev/null
+++ b/alembic/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/alembic/env.py b/alembic/env.py
new file mode 100644
index 0000000..8ec7bec
--- /dev/null
+++ b/alembic/env.py
@@ -0,0 +1,78 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import Connection
+from sqlalchemy.ext.asyncio import create_async_engine
+
+from alembic import context
+from crypkit.adapters.driven.repository.config import PostgresSettings
+from crypkit.adapters.driven.repository.schema import metadata
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    settings = PostgresSettings()
+    context.configure(
+        url=settings.to_url(),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    """Execute migrations."""
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        compare_type=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    settings = PostgresSettings()
+
+    engine = create_async_engine(
+        url=settings.to_url(),
+    )
+
+    async with engine.connect() as conn:
+        await conn.run_sync(do_run_migrations)
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())
diff --git a/alembic/script.py.mako b/alembic/script.py.mako
new file mode 100644
index 0000000..55df286
--- /dev/null
+++ b/alembic/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
diff --git a/alembic/versions/0001_init.py b/alembic/versions/0001_init.py
new file mode 100644
index 0000000..667bcc6
--- /dev/null
+++ b/alembic/versions/0001_init.py
@@ -0,0 +1,36 @@
+"""init
+
+Revision ID: 97c3eeffdbe6
+Revises:
+Create Date: 2025-03-29 22:46:05.403489
+
+"""
+
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "97c3eeffdbe6"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "cryptocurrencies",
+        sa.Column("id", sa.UUID(), nullable=False),
+        sa.Column("symbol", sa.String(), nullable=False),
+        sa.Column("metadata", postgresql.JSONB(none_as_null=True, astext_type=sa.Text()), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("cryptocurrencies")
+    # ### end Alembic commands ###
diff --git a/src/__init__.py b/crypkit/adapters/__init__.py
similarity index 100%
rename from src/__init__.py
rename to crypkit/adapters/__init__.py
diff --git a/crypkit/adapters/driven/__init__.py b/crypkit/adapters/driven/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/crypkit/adapters/driven/repository/__init__.py b/crypkit/adapters/driven/repository/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/crypkit/adapters/driven/repository/config.py b/crypkit/adapters/driven/repository/config.py
new file mode 100644
index 0000000..10474a9
--- /dev/null
+++ b/crypkit/adapters/driven/repository/config.py
@@ -0,0 +1,16 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class PostgresSettings(BaseSettings):
+    """Initialize Postgres configuration."""
+
+    host: str
+    port: int = 5432
+    username: str
+    password: str
+    database_name: str
+    max_connections: int = 5
+    model_config = SettingsConfigDict(env_prefix="CRYPKIT_POSTGRES_")
+
+    def to_url(self) -> str:
+        return f"postgresql+asyncpg://{self.username}:{self.password}@{self.host}:{self.port}/{self.database_name}"
diff --git a/crypkit/adapters/driven/repository/schema.py b/crypkit/adapters/driven/repository/schema.py
new file mode 100644
index 0000000..428dbfe
--- /dev/null
+++ b/crypkit/adapters/driven/repository/schema.py
@@ -0,0 +1,12 @@
+from sqlalchemy import Column, MetaData, String, Table
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+
+metadata = MetaData()
+
+CryptoCurrencyTable = Table(
+    "cryptocurrencies",
+    metadata,
+    Column("id", UUID, nullable=False, primary_key=True),
+    Column("symbol", String, nullable=False),
+    Column("metadata", JSONB(none_as_null=True), nullable=False),
+)
diff --git a/crypkit/adapters/driven/repository/sqlalchemy.py b/crypkit/adapters/driven/repository/sqlalchemy.py
new file mode 100644
index 0000000..587b20d
--- /dev/null
+++ b/crypkit/adapters/driven/repository/sqlalchemy.py
@@ -0,0 +1,79 @@
+from uuid import UUID
+
+from sqlalchemy import RowMapping, delete, exists, insert, select, update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from crypkit.adapters.driven.repository.schema import CryptoCurrencyTable
+from crypkit.core.error import DuplicityError, NotFoundError
+from crypkit.core.model import CryptoCurrency, CryptoId
+from crypkit.ports.driven.repository import Repository
+
+
+class SqlAlchemyRepository(Repository):
+    def __init__(self, session: AsyncSession) -> None:
+        self._session = session
+
+    async def load_all(self) -> list[CryptoCurrency]:
+        rows = await self._session.execute(
+            select(CryptoCurrencyTable).order_by(CryptoCurrencyTable.c.id)
+        )
+        result = []
+        for row in rows.mappings():
+            result.append(self._row_to_crypto_currency(row))
+        return result
+
+    async def delete(self, crypto_id: CryptoId) -> None:
+        if not await self._row_exists(crypto_id.id_):
+            raise NotFoundError()
+
+        await self._session.execute(
+            delete(CryptoCurrencyTable).where(CryptoCurrencyTable.c.id == crypto_id.id_)
+        )
+
+    async def save(self, crypto_currency: CryptoCurrency) -> CryptoCurrency:
+        memento = crypto_currency.memento()
+        if await self._row_exists(memento.id_):
+            raise DuplicityError()
+
+        await self._session.execute(
+            insert(CryptoCurrencyTable).values(
+                {
+                    "id": memento.id_,
+                    "symbol": memento.symbol,
+                    "metadata": memento.metadata,
+                }
+            )
+        )
+        return crypto_currency
+
+    async def update(self, crypto_currency: CryptoCurrency) -> CryptoCurrency:
+        memento = crypto_currency.memento()
+        if not await self._row_exists(memento.id_):
+            raise NotFoundError()
+
+        await self._session.execute(
+            update(CryptoCurrencyTable)
+            .values(
+                {
+                    "id": memento.id_,
+                    "symbol": memento.symbol,
+                    "metadata": memento.metadata,
+                }
+            )
+            .where(CryptoCurrencyTable.c.id == memento.id_)
+        )
+        return crypto_currency
+
+    @staticmethod
+    def _row_to_crypto_currency(row: RowMapping) -> CryptoCurrency:
+        return CryptoCurrency(
+            id_=CryptoId(row["id"]),
+            symbol=row["symbol"],
+            metadata=row["metadata"],
+        )
+
+    async def _row_exists(self, id_: str | UUID) -> bool:
+        row_exists = await self._session.execute(
+            select(exists().where(CryptoCurrencyTable.c.id == id_))
+        )
+        return bool(row_exists.scalar())
diff --git a/crypkit/core/error.py b/crypkit/core/error.py
index df2361f..76c316a 100644
--- a/crypkit/core/error.py
+++ b/crypkit/core/error.py
@@ -2,6 +2,10 @@ class NotFoundError(Exception):
     """Raised when cryptocurrency is not found in repository."""
 
 
+class DuplicityError(Exception):
+    """Raised when one cryptocurrency with id is already in repository."""
+
+
 class CoingeckoNotFoundError(Exception):
     """Raised when cryptocurrency is not found in Coingecko."""
 
diff --git a/crypkit/core/model.py b/crypkit/core/model.py
index 825a599..b1c37ee 100644
--- a/crypkit/core/model.py
+++ b/crypkit/core/model.py
@@ -13,6 +13,13 @@ class CryptoId:
     id_: UUID
 
 
+@dataclass(frozen=True)
+class CryptoCurrencyMemento:
+    id_: str
+    symbol: str
+    metadata: dict[Any, Any]
+
+
 class CryptoCurrency:
     id_: CryptoId
     symbol: Symbol
@@ -23,6 +30,11 @@ def __init__(self, id_: CryptoId, symbol: Symbol, metadata: dict[Any, Any]) -> N
         self.symbol = symbol
         self.metadata = metadata
 
+    def memento(self) -> CryptoCurrencyMemento:
+        return CryptoCurrencyMemento(
+            str(self.id_.id_), self.symbol.chars, self.metadata
+        )
+
     def __eq__(self, other: Any) -> bool:
         if isinstance(other, CryptoCurrency):
             return self.id_ == other.id_
diff --git a/crypkit/ports/driven/repository.py b/crypkit/ports/driven/repository.py
index dbd147d..cab711c 100644
--- a/crypkit/ports/driven/repository.py
+++ b/crypkit/ports/driven/repository.py
@@ -18,7 +18,10 @@ async def delete(self, crypto_id: CryptoId) -> None:
 
     @abstractmethod
     async def save(self, crypto_currency: CryptoCurrency) -> CryptoCurrency:
-        """Save cryptocurrency to database."""
+        """Save cryptocurrency to database.
+
+        :raises DuplicityError: If the cryptocurrency already exists.
+        """
 
     @abstractmethod
     async def update(self, crypto_currency: CryptoCurrency) -> CryptoCurrency:
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..63272b5
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,29 @@
+services:
+  postgres:
+    image: postgres:15.1
+    environment:
+      POSTGRES_DB: "test"
+      POSTGRES_USER: "test"
+      POSTGRES_PASSWORD: "test"
+    command: postgres -c log_statement=all
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: [ "CMD-SHELL", "sh -c 'pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB'" ]
+      timeout: 60s
+      interval: 5s
+      retries: 5
+      start_period: 10s
+
+  postgres_migrations:
+    build:
+      target: runtime
+    environment:
+      CRYPKIT_POSTGRES_HOST: "postgres"
+      CRYPKIT_POSTGRES_USERNAME: "${CRYPKIT_POSTGRES_USERNAME}"
+      CRYPKIT_POSTGRES_PASSWORD: "${CRYPKIT_POSTGRES_PASSWORD}"
+      CRYPKIT_POSTGRES_DATABASE_NAME: "${CRYPKIT_POSTGRES_DATABASE_NAME}"
+    command: alembic upgrade head
+    depends_on:
+      postgres:
+        condition: service_healthy
diff --git a/dockerfile b/dockerfile
new file mode 100644
index 0000000..f643dce
--- /dev/null
+++ b/dockerfile
@@ -0,0 +1,28 @@
+FROM python:3.12-bookworm AS builder
+
+RUN pip install poetry==2.1.1
+
+ENV POETRY_NO_INTERACTION=1 \
+    POETRY_VIRTUALENVS_IN_PROJECT=1 \
+    POETRY_VIRTUALENVS_CREATE=1 \
+    POETRY_CACHE_DIR=/tmp/poetry_cache
+
+WORKDIR /app
+
+COPY pyproject.toml poetry.lock ./
+RUN touch README.md
+
+RUN poetry install --without dev --no-root && rm -rf $POETRY_CACHE_DIR
+
+FROM python:3.12-slim-bookworm AS runtime
+
+ENV VIRTUAL_ENV=/app/.venv \
+    PATH="/app/.venv/bin:$PATH"
+
+COPY --from=builder ${VIRTUAL_ENV} ${VIRTUAL_ENV}
+
+COPY alembic ./alembic
+COPY alembic.ini ./alembic.ini
+COPY crypkit ./crypkit
+
+RUN ["echo", "TODO"]
diff --git a/poetry.lock b/poetry.lock
index 7e822b2..c9be038 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,5 +1,25 @@
 # This file is automatically @generated by Poetry 2.1.1 and should not be changed by hand.
 
+[[package]]
+name = "alembic"
+version = "1.15.2"
+description = "A database migration tool for SQLAlchemy."
+optional = false
+python-versions = ">=3.9"
+groups = ["main"]
+files = [
+    {file = "alembic-1.15.2-py3-none-any.whl", hash = "sha256:2e76bd916d547f6900ec4bb5a90aeac1485d2c92536923d0b138c02b126edc53"},
+    {file = "alembic-1.15.2.tar.gz", hash = "sha256:1c72391bbdeffccfe317eefba686cb9a3c078005478885413b95c3b26c57a8a7"},
+]
+
+[package.dependencies]
+Mako = "*"
+SQLAlchemy = ">=1.4.0"
+typing-extensions = ">=4.12"
+
+[package.extras]
+tz = ["tzdata"]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -24,6 +44,70 @@ files = [
     {file = "astroid-3.3.9.tar.gz", hash = "sha256:622cc8e3048684aa42c820d9d218978021c3c3d174fb03a9f0d615921744f550"},
 ]
 
+[[package]]
+name = "asyncpg"
+version = "0.30.0"
+description = "An asyncio PostgreSQL driver"
+optional = false
+python-versions = ">=3.8.0"
+groups = ["main"]
+files = [
+    {file = "asyncpg-0.30.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:bfb4dd5ae0699bad2b233672c8fc5ccbd9ad24b89afded02341786887e37927e"},
+    {file = "asyncpg-0.30.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:dc1f62c792752a49f88b7e6f774c26077091b44caceb1983509edc18a2222ec0"},
+    {file = "asyncpg-0.30.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:3152fef2e265c9c24eec4ee3d22b4f4d2703d30614b0b6753e9ed4115c8a146f"},
+    {file = "asyncpg-0.30.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c7255812ac85099a0e1ffb81b10dc477b9973345793776b128a23e60148dd1af"},
+    {file = "asyncpg-0.30.0-cp310-cp310-musllinux_1_2_aarch64.whl", hash = "sha256:578445f09f45d1ad7abddbff2a3c7f7c291738fdae0abffbeb737d3fc3ab8b75"},
+    {file = "asyncpg-0.30.0-cp310-cp310-musllinux_1_2_x86_64.whl", hash = "sha256:c42f6bb65a277ce4d93f3fba46b91a265631c8df7250592dd4f11f8b0152150f"},
+    {file = "asyncpg-0.30.0-cp310-cp310-win32.whl", hash = "sha256:aa403147d3e07a267ada2ae34dfc9324e67ccc4cdca35261c8c22792ba2b10cf"},
+    {file = "asyncpg-0.30.0-cp310-cp310-win_amd64.whl", hash = "sha256:fb622c94db4e13137c4c7f98834185049cc50ee01d8f657ef898b6407c7b9c50"},
+    {file = "asyncpg-0.30.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:5e0511ad3dec5f6b4f7a9e063591d407eee66b88c14e2ea636f187da1dcfff6a"},
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 plugins = ["setuptools"]
 
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+    {file = "markupsafe-3.0.2.tar.gz", hash = "sha256:ee55d3edf80167e48ea11a923c7386f4669df67d7994554387f84e7d8b0a2bf0"},
+]
+
 [[package]]
 name = "mccabe"
 version = "0.7.0"
@@ -292,14 +554,14 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pycodestyle"
-version = "2.12.1"
+version = "2.13.0"
 description = "Python style guide checker"
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.9"
 groups = ["dev"]
 files = [
-    {file = "pycodestyle-2.12.1-py2.py3-none-any.whl", hash = "sha256:46f0fb92069a7c28ab7bb558f05bfc0110dac69a0cd23c61ea0040283a9d78b3"},
-    {file = "pycodestyle-2.12.1.tar.gz", hash = "sha256:6838eae08bbce4f6accd5d5572075c63626a15ee3e6f842df996bf62f6d73521"},
+    {file = "pycodestyle-2.13.0-py2.py3-none-any.whl", hash = "sha256:35863c5974a271c7a726ed228a14a4f6daf49df369d8c50cd9a6f58a5e143ba9"},
+    {file = "pycodestyle-2.13.0.tar.gz", hash = "sha256:c8415bf09abe81d9c7f872502a6eee881fbe85d8763dd5b9924bb0a01d67efae"},
 ]
 
 [[package]]
@@ -581,6 +843,102 @@ files = [
     {file = "ruff-0.9.6.tar.gz", hash = "sha256:81761592f72b620ec8fa1068a6fd00e98a5ebee342a3642efd84454f3031dca9"},
 ]
 
+[[package]]
+name = "sqlalchemy"
+version = "2.0.40"
+description = "Database Abstraction Library"
+optional = false
+python-versions = ">=3.7"
+groups = ["main"]
+files = [
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+    {file = "sqlalchemy-2.0.40-py3-none-any.whl", hash = "sha256:32587e2e1e359276957e6fe5dad089758bc042a971a8a09ae8ecf7a8fe23d07a"},
+    {file = "sqlalchemy-2.0.40.tar.gz", hash = "sha256:d827099289c64589418ebbcaead0145cd19f4e3e8a93919a0100247af245fa00"},
+]
+
+[package.dependencies]
+greenlet = {version = ">=1", markers = "python_version < \"3.14\" and (platform_machine == \"aarch64\" or platform_machine == \"ppc64le\" or platform_machine == \"x86_64\" or platform_machine == \"amd64\" or platform_machine == \"AMD64\" or platform_machine == \"win32\" or platform_machine == \"WIN32\")"}
+typing-extensions = ">=4.6.0"
+
+[package.extras]
+aiomysql = ["aiomysql (>=0.2.0)", "greenlet (>=1)"]
+aioodbc = ["aioodbc", "greenlet (>=1)"]
+aiosqlite = ["aiosqlite", "greenlet (>=1)", "typing_extensions (!=3.10.0.1)"]
+asyncio = ["greenlet (>=1)"]
+asyncmy = ["asyncmy (>=0.2.3,!=0.2.4,!=0.2.6)", "greenlet (>=1)"]
+mariadb-connector = ["mariadb (>=1.0.1,!=1.1.2,!=1.1.5,!=1.1.10)"]
+mssql = ["pyodbc"]
+mssql-pymssql = ["pymssql"]
+mssql-pyodbc = ["pyodbc"]
+mypy = ["mypy (>=0.910)"]
+mysql = ["mysqlclient (>=1.4.0)"]
+mysql-connector = ["mysql-connector-python"]
+oracle = ["cx_oracle (>=8)"]
+oracle-oracledb = ["oracledb (>=1.0.1)"]
+postgresql = ["psycopg2 (>=2.7)"]
+postgresql-asyncpg = ["asyncpg", "greenlet (>=1)"]
+postgresql-pg8000 = ["pg8000 (>=1.29.1)"]
+postgresql-psycopg = ["psycopg (>=3.0.7)"]
+postgresql-psycopg2binary = ["psycopg2-binary"]
+postgresql-psycopg2cffi = ["psycopg2cffi"]
+postgresql-psycopgbinary = ["psycopg[binary] (>=3.0.7)"]
+pymysql = ["pymysql"]
+sqlcipher = ["sqlcipher3_binary"]
+
 [[package]]
 name = "tomlkit"
 version = "0.13.2"
@@ -623,4 +981,4 @@ typing-extensions = ">=4.12.0"
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.12"
-content-hash = "22c49f7ba6ba766327ab9473c94619186f127886ce7db8118854b433c41c2926"
+content-hash = "d3ff16e50db9a154c4a4367822249ed3a44a054c1e57f9b6afe1e11480690418"
diff --git a/pyproject.toml b/pyproject.toml
index b5a8981..e70a8f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,10 @@ python = "^3.12"
 pydantic = "2.11.1"
 pydantic-settings = "2.8.1"
 redis = "5.2.1"
+sqlalchemy = "2.0.40"
+asyncpg = "0.30.0"
+greenlet = "3.1.1"
+alembic = "1.15.2"
 
 
 [tool.poetry.group.dev.dependencies]
diff --git a/tests/acceptance/__init__.py b/tests/acceptance/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/acceptance/features/__init__.py b/tests/acceptance/features/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/acceptance/features/crypto/__init__.py b/tests/acceptance/features/crypto/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/acceptance/features/crypto/add.feature b/tests/acceptance/features/crypto/add.feature
new file mode 100644
index 0000000..b120889
--- /dev/null
+++ b/tests/acceptance/features/crypto/add.feature
@@ -0,0 +1,16 @@
+Feature: Add a new cryptocurrency  
+  As an API user  
+  I want to add a cryptocurrency to the database  
+  So that I can track its value  
+
+  Scenario: Successfully adding a cryptocurrency  
+    Given I provide the symbol of an existing cryptocurrency "BTC"  
+    When I send a request to create the cryptocurrency  
+    Then the cryptocurrency "BTC" is stored in the database  
+    And the cryptocurrency metadata is retrieved from the CoinGecko API  
+
+  Scenario: Adding a non-existing cryptocurrency  
+    Given I provide the symbol of a non-existing cryptocurrency "FAKECOIN"  
+    When I send a request to create the cryptocurrency  
+    Then I receive an error "Cryptocurrency does not exist"  
+    And the cryptocurrency is not stored in the database  
\ No newline at end of file
diff --git a/tests/acceptance/features/crypto/delete.feature b/tests/acceptance/features/crypto/delete.feature
new file mode 100644
index 0000000..25271fc
--- /dev/null
+++ b/tests/acceptance/features/crypto/delete.feature
@@ -0,0 +1,10 @@
+Feature: Delete a cryptocurrency  
+  As an API user  
+  I want to remove a cryptocurrency from the database  
+  So that it is no longer tracked  
+
+  Scenario: Successfully deleting a cryptocurrency  
+    Given the cryptocurrency "BTC" exists in the database  
+    When I send a request to delete the cryptocurrency "BTC"  
+    Then the cryptocurrency "BTC" is removed from the database  
+    And it is no longer present in the cryptocurrency list  
\ No newline at end of file
diff --git a/tests/acceptance/features/crypto/retrieve.feature b/tests/acceptance/features/crypto/retrieve.feature
new file mode 100644
index 0000000..7b696fc
--- /dev/null
+++ b/tests/acceptance/features/crypto/retrieve.feature
@@ -0,0 +1,9 @@
+Feature: Retrieve cryptocurrency list  
+  As an API user  
+  I want to fetch a list of stored cryptocurrencies
+  So that I can see which cryptocurrencies I am tracking  
+
+  Scenario: The list contains stored cryptocurrencies  
+    Given I have cryptocurrencies "BTC" and "ETH" in the database  
+    When I send a request to fetch the cryptocurrency list  
+    Then I receive a list containing "BTC" and "ETH"
\ No newline at end of file
diff --git a/tests/acceptance/features/crypto/update.feature b/tests/acceptance/features/crypto/update.feature
new file mode 100644
index 0000000..5cae9a8
--- /dev/null
+++ b/tests/acceptance/features/crypto/update.feature
@@ -0,0 +1,9 @@
+Feature: Update cryptocurrency metadata  
+  As an API user  
+  I want to update the metadata of a cryptocurrency  
+  So that I have the latest information  
+
+  Scenario: Successfully updating cryptocurrency data  
+    Given the cryptocurrency "BTC" exists in the database  
+    When I trigger a metadata update  
+    Then the cryptocurrency metadata is updated from the CoinGecko API  
\ No newline at end of file
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/adapters/__init__.py b/tests/integration/adapters/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/adapters/driven/__init__.py b/tests/integration/adapters/driven/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/adapters/driven/conftest.py b/tests/integration/adapters/driven/conftest.py
new file mode 100644
index 0000000..491eae1
--- /dev/null
+++ b/tests/integration/adapters/driven/conftest.py
@@ -0,0 +1,29 @@
+from collections.abc import AsyncGenerator
+
+import pytest
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from crypkit.adapters.driven.repository.config import PostgresSettings
+from crypkit.adapters.driven.repository.sqlalchemy import SqlAlchemyRepository
+from crypkit.ports.driven.repository import Repository
+
+
+@pytest.fixture()
+async def session_maker() -> async_sessionmaker[AsyncSession]:
+    settings = PostgresSettings()
+    engine = create_async_engine(settings.to_url())
+    return async_sessionmaker(bind=engine)
+
+
+@pytest.fixture()
+async def session(
+    session_maker: async_sessionmaker[AsyncSession],
+) -> AsyncGenerator[AsyncSession]:
+    async with session_maker() as session:
+        yield session
+        await session.commit()
+
+
+@pytest.fixture()
+async def repository(session: AsyncSession) -> Repository:
+    return SqlAlchemyRepository(session)
diff --git a/tests/integration/adapters/driven/test_repository.py b/tests/integration/adapters/driven/test_repository.py
new file mode 100644
index 0000000..b253808
--- /dev/null
+++ b/tests/integration/adapters/driven/test_repository.py
@@ -0,0 +1,44 @@
+import uuid
+from typing import Any
+
+import pytest
+from sqlalchemy import text
+from sqlalchemy.dialects.postgresql import insert
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from crypkit.adapters.driven.repository.schema import CryptoCurrencyTable
+from crypkit.adapters.driven.repository.sqlalchemy import SqlAlchemyRepository
+from tests.unit.ports.driven.test_repository import RepositoryTest
+
+
+class TestSqlAlchemyRepository(RepositoryTest):
+    @pytest.fixture(autouse=True)
+    async def setup(
+        self, session: AsyncSession, repository: SqlAlchemyRepository
+    ) -> None:
+        """Store session and repository instance."""
+        self._session = session
+        self._repository = repository
+
+    async def empty(self) -> None:
+        await self._session.execute(text("truncate table cryptocurrencies"))
+
+    async def insert(self, row: dict[str, Any]) -> None:
+        await self._session.execute(insert(CryptoCurrencyTable).values(**row))
+
+    async def load_by_id(self, id_: uuid.UUID) -> tuple[uuid.UUID, str, dict[str, Any]]:
+        result = await self._session.execute(
+            text("select * from cryptocurrencies where id = :id"), {"id": id_}
+        )
+        row = result.mappings().__next__()
+        return row["id"], row["symbol"], row["metadata"]
+
+    async def load_all(self) -> list[tuple[uuid.UUID, str, dict[str, Any]]]:
+        result = await self._session.execute(text("select * from cryptocurrencies"))
+        rows = []
+        for row in result.mappings():
+            rows.append((row["id"], row["symbol"], row["metadata"]))
+        return rows
+
+    async def repository(self) -> SqlAlchemyRepository:
+        return self._repository
diff --git a/tests/unit/ports/__init__.py b/tests/unit/ports/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/ports/driven/__init__.py b/tests/unit/ports/driven/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/ports/driven/test_repository.py b/tests/unit/ports/driven/test_repository.py
new file mode 100644
index 0000000..d7f4942
--- /dev/null
+++ b/tests/unit/ports/driven/test_repository.py
@@ -0,0 +1,237 @@
+import dataclasses
+import uuid
+from abc import ABC, abstractmethod
+from typing import Any
+
+import pytest
+
+from crypkit.core.error import DuplicityError, NotFoundError
+from crypkit.core.model import CryptoCurrency, CryptoId, Symbol
+from crypkit.ports.driven.repository import Repository
+
+
+@dataclasses.dataclass
+class Inserted:
+    id_: uuid.UUID
+    symbol: str
+    metadata: dict[str, Any]
+
+
+class RepositoryTest(ABC):
+    """Abstract test suite for all Repository implementations."""
+
+    @abstractmethod
+    @pytest.fixture
+    async def repository(self) -> Repository:
+        """Fixture providing a concrete implementation of Repository."""
+
+    @abstractmethod
+    async def empty(self) -> None:
+        """Empty the repository."""
+
+    @abstractmethod
+    async def insert(self, row: dict[str, Any]) -> None:
+        """Insert one row into the repository."""
+
+    @abstractmethod
+    async def load_by_id(self, id_: uuid.UUID) -> tuple[uuid.UUID, str, dict[str, Any]]:
+        """Load one record from the repository."""
+
+    @abstractmethod
+    async def load_all(self) -> list[tuple[uuid.UUID, str, dict[str, Any]]]:
+        """Load all records from the repository."""
+
+    @pytest.fixture(autouse=True)
+    async def setup_before_each_test(self, repository: Repository) -> None:
+        await self.empty()
+
+    async def test_load_all_empty(self, repository: Repository) -> None:
+        # given empty repository
+        # when load_all is called
+        it = await repository.load_all()
+
+        # then it returns one Cryptocurrency
+        assert it == []
+
+    async def test_load_one(self, repository: Repository) -> None:
+        # given one cryptocurrency in repository
+        inserted = await self._insert()
+
+        # when load_all is called
+        it = await repository.load_all()
+
+        # then it returns one CryptoCurrency
+        assert it == [
+            CryptoCurrency(
+                id_=CryptoId(inserted.id_),
+                symbol=Symbol(inserted.symbol),
+                metadata=inserted.metadata,
+            )
+        ]
+
+    async def test_load_multiple(self, repository: Repository) -> None:
+        # given many cryptocurrencies in repository
+        expected: list[Inserted] = []
+        for i in range(10):
+            inserted = await self._insert(
+                symbol=f"symbol{i}",
+                metadata={"symbol": f"symbol{i}", "other": ["funny", "data"], "i": i},
+            )
+            expected.append(inserted)
+
+        # when load_all is called
+        it = await repository.load_all()
+
+        # then it returns all CryptoCurrencies sorted by id
+        expected = sorted(expected, key=lambda x: x.id_)
+        assert it == [
+            CryptoCurrency(
+                id_=CryptoId(i.id_),
+                symbol=Symbol(i.symbol),
+                metadata=i.metadata,
+            )
+            for i in expected
+        ]
+
+    async def test_delete_empty(self, repository: Repository) -> None:
+        with pytest.raises(NotFoundError) as context:
+            # given empty repository
+            # when delete is called
+            await repository.delete(CryptoId(id_=uuid.uuid4()))
+
+        # then exception is raised
+        assert context.type == NotFoundError
+
+    async def test_delete_not_found(self, repository: Repository) -> None:
+        with pytest.raises(NotFoundError) as context:
+            # given one CryptoCurrency in repository
+            inserted = await self._insert()
+
+            # when delete is called with different id
+            await repository.delete(CryptoId(id_=uuid.uuid4()))
+
+        # then exception is raised
+        assert context.type == NotFoundError
+        # and CryptoCurrency is still there
+        it = await self.load_by_id(id_=inserted.id_)
+        assert it == (inserted.id_, inserted.symbol, inserted.metadata)
+
+    async def test_delete_found(self, repository: Repository) -> None:
+        # given many cryptocurrencies in repository
+        inserted = []
+        for i in range(10):
+            insert = await self._insert(
+                symbol=f"symbol{i}",
+                metadata={"symbol": f"symbol{i}", "other": ["funny", "data"], "i": i},
+            )
+            inserted.append(insert)
+
+        # when delete is called with first id
+        await repository.delete(CryptoId(id_=inserted[0].id_))
+
+        # then the one is removed from repository
+        all_in_repo = await self.load_all()
+        assert len(all_in_repo) == len(inserted) - 1
+        for one_in_repo in all_in_repo:
+            assert one_in_repo[0] != inserted[0].id_
+
+    async def test_save_duplicate(self, repository: Repository) -> None:
+        with pytest.raises(DuplicityError) as context:
+            # given one cryptocurrency in repository
+            inserted = await self._insert()
+
+            # when save is called with the same id
+            await repository.save(
+                CryptoCurrency(
+                    id_=CryptoId(inserted.id_), symbol=Symbol("anything"), metadata={}
+                )
+            )
+
+        # then the exception is raised
+        assert context.type == DuplicityError
+
+    async def test_save(self, repository: Repository) -> None:
+        # given empty repository
+        id_ = uuid.uuid4()
+        symbol = "anything"
+        metadata = {"symbol": symbol}
+        expected = CryptoCurrency(
+            id_=CryptoId(id_), symbol=Symbol(symbol), metadata=metadata
+        )
+
+        # when save is called
+        it = await repository.save(expected)
+
+        # then cryptocurrency is saved in repository
+        all_in_repo = await self.load_all()
+        assert len(all_in_repo) == 1
+        the_one = all_in_repo[0]
+        assert the_one[0] == id_
+        assert the_one[1] == symbol
+        assert the_one[2] == metadata
+
+        # and it is returned
+        assert expected == it
+
+    async def test_update_not_found(self, repository: Repository) -> None:
+        with pytest.raises(NotFoundError) as context:
+            # given one CryptoCurrency in repository
+            await self._insert()
+
+            # when update is called with different id
+            await repository.update(
+                CryptoCurrency(
+                    id_=CryptoId(uuid.uuid4()), symbol=Symbol("anything"), metadata={}
+                )
+            )
+
+        # then exception is raised
+        assert context.type == NotFoundError
+
+    async def test_update(self, repository: Repository) -> None:
+        # given two CryptoCurrencies in repository
+        inserted = await self._insert()
+        await self._insert()
+
+        # when update is called with the same id and different symbol
+        update_symbol = "anything"
+        update_metadata = {"symbol": update_symbol}
+        it = await repository.update(
+            CryptoCurrency(
+                id_=CryptoId(inserted.id_),
+                symbol=Symbol(update_symbol),
+                metadata=update_metadata,
+            )
+        )
+
+        # then it is updated
+        all_in_repo = await self.load_all()
+        assert len(all_in_repo) == 2
+        the_one = next(filter(lambda x: x[0] == inserted.id_, all_in_repo))
+        assert the_one[0] == inserted.id_
+        assert the_one[1] == update_symbol
+        assert the_one[2] == update_metadata
+        # and updated value is returned
+        assert it == CryptoCurrency(
+            id_=CryptoId(inserted.id_),
+            symbol=Symbol(update_symbol),
+            metadata=update_metadata,
+        )
+
+    async def _insert(
+        self, symbol: str = "symbol", metadata: dict[str, Any] | None = None
+    ) -> Inserted:
+        a_symbol = symbol or "symbol"
+        a_metadata = metadata or {
+            "symbol": symbol or "symbol",
+            "other": ["funny", "data"],
+        }
+        id_ = uuid.uuid4()
+        await self.insert(
+            row={
+                "id": id_,
+                "symbol": a_symbol,
+                "metadata": a_metadata,
+            }
+        )
+        return Inserted(id_, a_symbol, a_metadata)